Hi there,
I want to order the intel optane p5800 u.2 drive for my threadripper 5975wx machine which is using a asrock wrx80 creator motherboard.
Which is the best pcie express (card) 4.0 to u.2 converter ?
I see there is a few options like on amazon, “startech” seems to be one
any recommendations?
PCIe 4.0 qualified ones are hard to find. You’ll want short cables too to minimize noise/crosstalk.
Only one I know of is:
You’ll need SFF-8654 to U.2 cables:
I have a pair of these which work great for PCIe 3.0 :
thanks!
what about this ?
Looks promising, but apparently success varies a lot so personally I would only buy if someone reported success with it. I think the “canonical” thread for this is : A Neverending Story: PCIe 3.0/4.0/5.0 Bifurcation, Adapters, Switches, HBAs, Cables, NVMe Backplanes, Risers & Extensions - The Good, the Bad & the Ugly 
What you’ll want is a U.2 carrier card which plugs directly into the PCIe slot, or a card which plugs into the PCIe slot and presents an OCuLink connector.
A third option, which I will be able to test out in two weeks, is a PCIe riser cable which has a U.2 connector on the other end. You can get those in lengths as short as 5 cm. I bought a 15 cm one and a PCIe adapter bracket that can dangle a 2.5″ drive over a PCIe or M.2 slot to keep the distance very short.
I’ve had very good results with Micro SATA Cables’ products. And they do sell the cards adapters and cables necessary for your P5800X.
I ended up ordering 2 905p drives me a bunch of u.2 accessories.
turns out they just come in the box
woops
make sure you actually need those items first
This is what im likely going to pull the trigger on , the only 2 PCIe 4.0 cards I could find …
If Im going to stick them hands deep into the cookie jar for a p5800x I might as well ensure it runs as best it can …
Anyone have positive or negative experiences with either these 2?
The only PCIe Slot-to-U.2 adapters I haven’t had issues with so far were the ones from Delock that are rated for Gen4:
Delock 90071 for 1xU.2 (seems to be from the same OEM as the Ableconn, but be aware there might still be differences, sometimes due to a lack of quality control even if the cards from different distributors look the same)
Delock 90092 for 4xU.2 (unfortunately currently unavailable)
Using a single SSD is the least amount of pain with these adapter cards, bad-quality ones for two or four drives can mess things up quite a bit with PCIe Gen4 SSDs.
Example: 2 x Gen3 SSDs work fine, if you use Gen4 SSDs one gets recognized with a Gen4 interface link but bad signal traces mess up the other SSD’s link so it gets downgraded to Gen1.
Thanks ! Your tips is gold . Sorry you had to pay the “school fees” to give it .
I use the myus.com forwarding service so I “shop” in the us send there and from there I would DHL to myself here in Capetown South Africa .
Where is the best place to buy the 'delock" brand u.2 adapter’s ? Amazon and Newegg seem no good
I have my 2 p5800x connected to an Adaptec HBA Ultra 1200P-32i SAS HBA via Broadcom 05-60005-00 cable.
The drives are exposed to linux as scsi devices, so you can’t use nvmecli util, but they are running at PCIe 4.0 speed.
Device #0
Device is a Hard drive
State : Raw (Pass Through)
Drive has stale RIS data : False
Disk Name : /dev/sdi
Block Size : 512 Bytes
Physical Block Size : 512 Bytes
Transfer Speed : PCIe 4.0 (16.0 GT/s)
Reported Channel,Device(T:L) : 0,24(24:0)
Reported Location : Direct Attached, Slot 0(Connector 3:CN3)
Vendor : NVME
Model : INTEL SSDPF21Q400GB
Firmware : L0310200
World-wide name : 0000000000000000
Reserved Size : 32768 KB
Used Size : 0 MB
Unused Size : 381522 MB
Total Size : 381554 MB
Write Cache : Unknown
S.M.A.R.T. : No
S.M.A.R.T. warnings : 0
SSD : Yes
Boot Type : None
Current Temperature : 31 deg C
Maximum Temperature : 32 deg C
Threshold Temperature : 70 deg C
PHY Count : 4
Drive Configuration Type : HBA
Mount Point(s) : Not Mounted
Drive Exposed to OS : True
Sanitize Erase Support : True
Sanitize Lock Freeze Support : False
Sanitize Lock Anti-Freeze Support : False
Sanitize Lock Setting : None
Usage Remaining : 0 percent
Estimated Life Remaining : Not Applicable
SSD Smart Trip Wearout : False
56 Day Warning Present : False
Drive SKU Number : Not Applicable
Drive Part Number : Not Applicable
Last Failure Reason : No Failure
----------------------------------------------------------------
Device Phy Information
----------------------------------------------------------------
Phy #0
Negotiated Physical Link Rate : PCIe 4.0 (16.0 GT/s)
Negotiated Logical Link Rate : PCIe 4.0 (16.0 GT/s)
Maximum Link Rate : PCIe 4.0 (16.0 GT/s)
Phy #1
Negotiated Physical Link Rate : PCIe 4.0 (16.0 GT/s)
Negotiated Logical Link Rate : PCIe 4.0 (16.0 GT/s)
Maximum Link Rate : PCIe 4.0 (16.0 GT/s)
Phy #2
Negotiated Physical Link Rate : PCIe 4.0 (16.0 GT/s)
Negotiated Logical Link Rate : PCIe 4.0 (16.0 GT/s)
Maximum Link Rate : PCIe 4.0 (16.0 GT/s)
Phy #3
Negotiated Physical Link Rate : PCIe 4.0 (16.0 GT/s)
Negotiated Logical Link Rate : PCIe 4.0 (16.0 GT/s)
Maximum Link Rate : PCIe 4.0 (16.0 GT/s)
----------------------------------------------------------------
Device Error Counters
----------------------------------------------------------------
Aborted Commands : 0
Bad Target Errors : 0
Ecc Recovered Read Errors : 0
Failed Read Recovers : 0
Failed Write Recovers : 0
Format Errors : 0
Hardware Errors : 0
Hard Read Errors : 0
Hard Write Errors : 0
Hot Plug Count : 0
Media Failures : 0
Not Ready Errors : 0
Other Time Out Errors : 0
Predictive Failures : 0
Retry Recovered Read Errors : 0
Retry Recovered Write Errors : 0
Scsi Bus Faults : 0
Sectors Reads : 0
Sectors Written : 0
Service Hours : 21
Command completed successfully.
I actually did use the red Ableconn one with a P5800X successfully. This was a couple years ago when it was one of the only units claiming PCIe 4.0, but with more on the market now, it may not actually be special. I also found it interesting there are no power components on the board (may not be necessary anyway, but it’s curious).
Related to @wendell 's latest video, I have used these Redrivers since a month or two after the P5800X came out. I prefer the SFF-8654 one as it is a flatter profile, although be aware that on some boards and with some cables, it can intersect the chipset heatsink in some slots (like W680-ACE)
[https://www.amazon.com/dp/B08VNHNYHK](https://PCIe Gen4 to SlimSAS 4i (SFF-8654) Adapter with ReDriver)
I’ve gone one step further with these and used a SlimSAS 8i → 2x 4i cable to connect up to a dual-slot PCIe adapter, and am able to run an RTX 3070 @ PCIe 4.0 x4 (for Blue Iris AI & codec acceleration in a VM), and also an LSI/Broadcom 9500-16e at PCIe 4.0 x4. Yes, running off of different m.2 slots, muxing into the same cable (not shocking that it works, but still neat, especially at PCIe 4.0 speeds).
Always seek cables 50cm or shorter whenever possible as I have seen issues crop up at 70cm, including with the attractively-priced DiLinker cables. I stuck with 10gtek 85-ohm (important) in the end, after learning that is what C Payne PCBs has also found to be optimal.
I just bought the Gen4 to SlimSAS 4i (SFF-8654) Adapter with ReDriver+ a 50 cm matching cable 
To ease my mind, so for more than a year you haven’t had any WHEA event?
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